Created attachment 222842 [details]
Patch to address issues described.
1) /etc/periodic has special cases for zcat and bzcat,
but not for zstd and xz which newsyslog also supports.
2) newsyslog.conf manpage does not have a xref for zstd(1).
3) usr.sbin/periodic/etc/monthly/200.accounting does not use temporary
4) periodic.conf(5) refers to "daily accounting" and
"monthly accounting" withouth being clear that "daily"
means process accounting and "monthly" is login accounting.